Boiler fan permanent magnetism speed governing economizer system

The utility model discloses a boiler fan permanent magnetism speed governing economizer system, including the draught fan, draw fan drive motor and boiler, the air outlet of draught fan links to each other with the boiler, the draught fan is provided with the magnetic coupling ware with drawing between the fan drive motor, the magnetic coupling ware includes rotor part and controller, the rotor part is including conductor rotor and permanent magnet rotor, the conductor rotor with draw the fan drive motor shaft and connect, the bearing connection is passed through in permanent magnet rotor's the pivot and the pivot of draught fan, the partial rotor casing that is provided with of rotor, be provided with the bearing casing on the bearing, be provided with the rotor cooling device on the rotor casing, be provided with bearing cooling device on the bearing casing, the adjustable driving motor's of magnetic coupling ware output speed to adjust the rotational speed of draught fan, realize the regulation of draught fan air output, realize the regulation of boiler intake promptly.